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Panasonic SJ-MJ55GH Service Manual

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ORDER No.AD0211153C3
Portable MD Player
SJ-MJ55GH
Colour
(S)...................Silver Type
SPECIFICATIONS
Specifications
Table of Contents
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Summary of Contents for Panasonic SJ-MJ55GH

  • Page 1 ORDER No.AD0211153C3 Portable MD Player SJ-MJ55GH Colour (S)....Silver Type SPECIFICATIONS Specifications...
  • Page 2 Battery type: Play time (Stereo/ LP2/ LP4) Rechargeable: 40 hours/ 53 hours/ 70 hours Panasonic alkaline: 63 hours/ 93 hours/ 121 hours Both together: 103 hours/ 148 hours/ 193 hours [When the rechargeable battery (included) is fully recharged.]...

  • Page 3: Precaution Of Laser Diode

    Notes: - The play time may be less depending on the operating conditions. - Specifications are subject to change without notice. Weight and dimensions are approximate. 2002 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1.

  • Page 4: Operating Instructions

    3. Operating Instructions 4. Handling Precautions for MD Mechanism (Optical pickup) The laser diode in the MD mechanism (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body. So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup). 4.1.
  • Page 5 Fig. 2 4.2. Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-static wrist strap to discharge the static electricity from your body. (as shown in Fig. 3 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground the sheet.

  • Page 6: Operation Checks And Component Replacement Procedures

    Fig. 4 5. Operation Checks and Component Replacement Procedures - This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. - For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required.
  • Page 7 - Check the P.C.B. as shown below.
  • Page 8 5.2. Replacement for the intermediate cabinet - Follow the (Step1)-(Step3) of item 5.1.
  • Page 9 5.3. Replacement for the disk cover ass’y and the link units (L), (R) - Follow the (Step1)-(Step3) of item 5.1. - Follow the (Step1)-(Step4) of item 5.2.
  • Page 10 5.4. Replacement for the traverse motor - Follow the (Step1)-(Step3) of item 5.1.
  • Page 11 5.5. Replacement for the optical pickup - Follow the (Step1)-(Step3) of item 5.1. - Follow the (Step1)-(Step5) of item 5.4.

  • Page 13: Measurements And Adjustments

    6. Measurements and Adjustments Note: After replacing the main components (optical pickup, traverse motor, IC201, IC202 or P.C.B. ass’y, etc.) of mechanism unit block, change to the adjust mode, and then perform the “Laser power adjustment”, “Off-setautomatic adjustment” and “Playback-only disc/magneto-optical disc automatic adjustment”.
  • Page 14 1. Set the battery and connect the remote controller. (The position of the HOLD switch of remote controller is “OFF”.) 2. Turn off the power, and switch main unit’s HOLD switch off. 3. Press the VOL+( ), VOL-( ), ( ), and ( )keys on the remote controller within two seconds.
  • Page 15 6.2.2. Laser Power Adjustment Adjust each laser power: read power for reading (play). 6.2.2.1. Set the Unit to the Adjustment Mode Cautions About handling the optical pickup and the magnetic head. - The optical pickup is structured precisely; therefore, it is very fragile.
  • Page 16 3. Press the key of the remote controller (“T0E ” changes to “LD ” of the LCD). 4. Press the key of the remote controller (“LD ” changes to “LP ” of the LCD). 5. Set the laser power at 600 W±10% by using VOL+ and VOL- key of the remote controller.
  • Page 17 Fig. 8 [How to open the shutter] 1. Insert a thin and hard card to the crevice between laser power meter, and pull a card in the direction of an arrow (1). 2. A stopper moves in the direction of an arrow (2). 3.
  • Page 18 6.2.3. Off-set automatic adjustment 1. With “T1E ” displayed, leave the disc cover open. 2. Pressing the key on the remote controller will start adjustment. 3. During adjustment, “FADJ ” is displayed on the LCD of the remote controller. If there is no abnormality, “FOK ” will be displayed. 4.
  • Page 19 remote controller. / If there is no abnormality, “AOK ” will be displayed. Note: If it is displayed “ANG ”, check “7. Troubleshooting Guide” in the order. 4. Press key (“AOK ” or “ANG ” changes to “T2E ”). 5. After the adjustment is finished, remove the disc. 6.2.5.

  • Page 20: Troubleshooting Guide

    Main unit’s keys LCD display position and letters After the second key is pressed, the first digit displayed will change from “ ” to “O ”. HOLD OFF VOL+ After the second key is pressed, the second digit displayed will change from “ ”...
  • Page 29 8. Precaution for Replacement of EEPROM IC (IC202) and SYSTEMCONTROL IC (IC201) 8.1. Replacement of EEPROM IC (IC202) In case of replacing EEPROM IC (IC202), depending on the Parts No. of SYSTEMCONTROL (IC201), it is need to replace SYSTEMCONTROL simultaneously. For details, please refer to the following table.

  • Page 30: Schematic Diagram Notes

    After replacing P.C.B. ASS’Y, please be sure to perform the “laser power adjustment”, “Off-set automatic adjustment” and “Playback only disc/magneto-optical disc automatic adjustment”.(Refer to “6 Measurements and Adjustments ”) If the set is operated without adjusting, an error will be displayed and the set will not operate. 10.

  • Page 31: Schematic Diagram

    Secondary trouble can be prevented by taking care during repair. Cover the parts boxes made of plastics with aluminum foil. Ground the soldering iron. Put a conductive mat on the work table. Do not touch the legs of IC or LSI with the fingers directly. Voltage and signal line : Positive voltage line : Playback signal line...
  • Page 32 Mark Function Division SETR Band pass filter control input terminal — GND terminal APC output terminal I/V converted laser quantity of light input terminal LDREF Laser control signal input terminal 1/2VCC (reference voltage) output terminal Connected to GND through capacitor Wobble signal output terminal C signal dark-side detection...
  • Page 33 14.2. IC101 (C1BB00000729): DIGITAL SERVO PROCESSOR Mark Function Division Power supply input terminal SLCO HF signal slicing level output terminal SLCISET Slicing level adjustment bias resistor input terminal EFMIN HF signal input terminal TEST1 Test terminal / (Connected to power supply) RESET B System reset input terminal Ttack detection signal...
  • Page 34 Mark Function Division AVDD1D Power supply input terminal AVSS1 — GND terminal ADIPWO Wobble signal input terminal TEPWM — Not used, open FEPWM — Not used, open ABPWM — Not used, open Connected to GND through reistor SOUT — Not used, open SCLK —...
  • Page 35 Mark Function Division SLD0 Sled control signal output terminal SLD1 Sled control signal input terminal SLD2 Sled control signal input terminal SLD3 Sled control signal input terminal 68 FOPWMF Focus PMW output terminal 69 FOPWMR Focus PMW output terminal 70 TRPWMF Tracking PMW output terminal 71 TRPWMR...
  • Page 36 Mark Function Division DPVSS — GND terminal for buffer amp. PWM output Power supply input terminal 16.9344MHz oscillate input terminal XOUT 16.9344MHz oscillate output terminal — GND terminal VCC2 Power supply input terminal DDOUT Digital audio output terminal (Not used, open) —...
  • Page 37 Mark Function Division VREF- — Connected to GND Remote control key input REM_KEY terminal KEYIN Unit key input terminal BATT Battery voltage detection input terminal (AN3) — Connected to GND (AN4) — Connected to GND (AN5) — Connected to GND OUTC —...
  • Page 38 Mark Function Division BWCT EQ frequency gain switching output terminal CHARGE Recharge control output terminal 30 LD_PWM Laser power controlling PWM output terminal DCIN_ Charger starting detection signal input terminal WAKEUP INTB IC101 interrupt signal input terminal WRQB IC101 interrupt signal input terminal 34 OPEN_SW Lid open/ close detection...
  • Page 39 Mark Function Division ELON EL display control output terminal (L: Start) — — Not used, open Focus OK signal input terminal 53 DRV_STBY Driver IC standby output terminal 54 SP_STBY Driver IC circuit spindle standby output terminal MUTE_P — Not used, open —...
  • Page 40 Mark Function Division 3DSW Head phone surround mode change switch output terminal MUTE_ Mute mode dicision input terminal MODE (Connect to GND) LED_CNT6_LP4_R O RED LED (PLAY1) control output terminal LED_CNT5_LP2_G O GREEN LED (PLAY2) control output terminal 76 LED_CNT4_G O GREEN LED (R_SKIP) control output terminal 77 LED_CNT3_G O...
  • Page 41 Mark Function Division MODE PWM frequency switching input terminal 3-phase sled drive power supply input terminal Spindle motor block brake input terminal PGND4 — GND terminal SUCO Sled driver block position detection comparator output terminal 3-phase sled (U) output terminal 3-phase sled (V) output terminal SVCO...
  • Page 42 Mark Function Division 3-phase sled block logic input terminal PWM signal input terminal (H: Output TR ON) — GND terminal Spindle motor position detection comparator filter output terminal COMIN Spindle motor position detection comparator filter input terminal VCOIN VCO control voltage input terminal (Connected to GND through capacitor)
  • Page 43 Mark Function Division IN1F H bridge (1) logic forward input terminal 15. Caution in Use of Rechargeable Battery Ass'y - Take Rechargeable Battery Ass’y out of Battery Carrying Case and use it. - Be sure to carry Rechargeable Battery Carrying Case. If not, it may either heat or ignite by shorting with a metal.

  • Page 44: Replacement Parts List

    17. Replacement Parts List Notes: *Important safety notice: / Components identified by mark have special characteristics important for safety. *Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. *When replacing any of components, be sure to use only manufacture’s specified parts shown in the parts list.
  • Page 45 Ref. No. Part No. Part Name & Description Remarks RDG0477 INTERMEDIATE GEAR RHD14078 SCREW RHW11011 WASHER RMC0483 HOLDER SPRING RXK0354-1 TRAVERSE UNIT BRL1A1CWB TRAVERSE MOTOR RHD14074 SCREW RJC99038-2 RECHARGE.BATT.TERMINAL(-) XQN14+B2FC SCREW RAF2000A-4M OPTICAL PICK-UP RXJ0025-1 DRIVE SHAFT RHD14067 SCREW RJC99039-1 RECHARGE.BATT.TERMINAL(+) RJR0195-2 BATTERY SHAFT...
  • Page 46 C108 ECUE1H102KBQ 50V 1000P F1G1H102A457...
  • Page 47 Ref. No. Part No. Part Name & Description Remarks C113 ECUENA104KBQ 10V 0.1U F1G1A104A014 C115 ECUENA104KBQ 10V 0.1U F1G1A104A014 C116 ECJ0EB1C822K 16V 8200P C117 ECUE1H102KBQ 50V 1000P F1G1H102A457 C130 ECJ1VB0J105K 6.3V 1U C131,32 F1G1E472A059 25V 4700P C133 F3E0G106A001 4V 10U C201 F1G1C103A044 16V 0.01U...
  • Page 48 Ref. No. Part No. Part Name & Description Remarks C615 ECUENA104KBQ 10V 0.1U F1G1A104A014 C616 F1G1H680A410 50V 68P C621,22 F1G1H271A401 50V 270P C801 F5A421050001 4V 1U C803-06 F1J0J4750010 6.3V 4.7U C807,08 F3F1A226A008 10V 22U RJS2A7121T CONNECTOR(21P) K1MN21B00028 CP201 K1MN13B00065 CONNECTOR(13P) CP301,02 RJS2A7104T CONNECTOR(4P)
  • Page 49 Ref. No. Part No. Part Name & Description Remarks B1CHMC000001 TRANSISTOR Q201 2SD1819ASTX TRANSISTOR 2SD1819ASL Q202 B1ADMB000003 TRANSISTOR Q203-05 B1GFCFJN0013 TRANSISTOR Q402,03 B1CHMC000001 TRANSISTOR Q404,05 B1DFAC000003 TRANSISTOR Q406,07 2SB1218ASTX TRANSISTOR 2SB1218ASL Q408 B1HFCFA00005 TRANSISTOR Q410 B1DFAC000003 TRANSISTOR Q411 B1MBADA00001 TRANSISTOR Q412 B1DFAC000003 TRANSISTOR...

  • Page 50: Cabinet Parts Location

    Ref. No. Part No. Part Name & Description Remarks R303 ERJ2GEJ682X 1/4W 6.8K ERJ2RMJ682X R305 ERJ2GEJ393X 1/4W 39K ERJ2RMJ393X R401 ERJ2GEJ225X 1/4W 2.2M ERJ2RMJ225X R402 D1H84744A024 470K R403 D1H447420001 470K R404 ERJ2GEJ274X 1/4W 270K D0GA274JA001 R405 ERJ2GEJ105 1/4W 1M D0GA105JA001 R406 D1H84744A024 470K...
  • Page 51 19. Packaging...

  • Page 52: Schematic Diagram For Printing With A4 Size

    20. Schematic Diagram for Printing with A4 Size H0211TN/HH...

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